Sharp CE-150 printer/cassette interface questions

[Jeff_Birt]

Nylon gears often have a bit of glass in them. This increases the strength but makes them brittle. They will break/crack before yielding. This also makes them a little abrasive. A filled nylon gear running against a steel gear will wear out the steel.

Brass is a bit 'slippery' but will still wear when used with a filled nylon gear. Given the limited RPM/torque it is a good choice for the application. I would not worry about it wearing out the plastic gears.